97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

<strong id="tuvxj"></strong>

<pre id="tuvxj"><strong id="tuvxj"></strong></pre>

<pre id="tuvxj"><strong id="tuvxj"></strong></pre>

單項選擇題

The （）(吊桿托架) supports the derrick.

A. derrick boom rest
B. derrick head
C. derrick mast
D. derrick guy

你可能感興趣的試題

單項選擇題

The （）(千斤滑車) can run the gooseneck.

A. heavy derrick
B. pulley block
C. topping lift block
D. guy tackle

單項選擇題

The （）(重吊桿) can lift heavy cargo.

A. heavy cargo derrick
B. heavy deck
C. jumbo boom
D. heavy block

<ruby id="r7w4t"><output id="r7w4t"></output></ruby>